Recently I found the game Tal vs. Byrne (1976), that opens with Chekhover Variation of the Sicilian Defense. What got my attention in this variation was move 7, for, just like Tal did, every engine says that the best move is 7. Nc3, but for some reason I like how 7. Ng5 looks:
[FEN ""] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Bb5 Bd7 6. Bxc6 Bxc6 7. Ng5!? (7. Ng5 e5 8. Qc4 Qd7)
Stockfish 6 says it is slightly better for black (-0.8 at depth=22 to be precise), but the main idea is simply to explore the weakness of the f7 pawn. The main line I was thinking was 7... e5 8. Qc4, the natural urge to punish the white queen at the center creates the threat of mate on f7, so black is somewhat obligated to lift the queen to the 7th rank. Anyway, if this "trick" fails, for example after 8... Qd7, there is no immediate advantage for white, and it seems that the only difference from Tal's 1976 variation is that here white is behind in development (and ready to be punished!).
I couldn't find any game with the move 7. Ng5 in chessgames.com, but I still think that it is a natural looking move that seems to have a possible tactic behind it, even if I wasn't able to find. So my question is:
Is 7. Ng5 really only a bad move? The downside is that obvious? Or there is a possible tactic behind it? (besides the threat of mate on f7 after 7... e5 8. Qc4)